Rock strata provide the following evidence:
A) Relative ages - Rock strata can be used to determine the relative ages of the layers based on their position (principle of superposition) and the fossils they contain (biostratigraphy).
While rock strata can sometimes provide context for dating events, they do not typically offer exact dates (B). Exact dates often require radiometric dating techniques applied to specific minerals or rocks.
C) Locations of fossils - Strata can indicate the locations where certain fossils are found, helping to reconstruct past environments and the biological history of an area.
In summary, the most significant evidence provided by rock strata is A) relative ages, and they can also indicate C) locations of fossils.